Lock



April 6 1926. 1,579,736

' E. B. STONE LOCK Filed Dec. 4, 1922 Patented Apr. 6, 1926;

- UNITED; STATES ELMER B. STONE, on NEW BRITAIN, connnorIcur, ASSIGNOR TO THE A ERIOAN HARDWARE CORPORATION, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

, oon.

Application filed December To all wh'm:. it may co'nccm: I

Be it known that I, 'ELMnn B. STONE, a citizen of the United States,'and a resident of New Britain, in thecounty of Hartford 6 and State of Connecticut, have invented new and Improved Locks, of which the following is a'specification.

My invention relates more especially to that class of locks known as cylinder or pin tumbler locks, and an object of my invention, ainongothcrs, is to provide effective a means for preventing mutilation of the lock me1nbers,and especially suchv mutilation for. the purposeof enabling the lock to be released, as to" its locking members.

One form of lock embodying my invention and in the construction and use of which the objects herein set out, as well as others, may be attained, is illustrated in the accompanying drawings, in which- Figure 1 is a view in section through my improved lockshown as secured toasupport, the plug being shown in full; p f

Figure 2 is a similar View, the plane of section, however, being located at an angle of ninety degrees from the plane of view of Figure 1. p 4

Figure 8 is a front view of my improved lock. p Q Figure 4 is a View in side elevation of my improved lock shown as mounted in a support. In the accompanying drawings the numeral 5 denotes a support, as a door or other stru'cturetowhich the lock is secured, said lock comprising a cylinder 6, a'plug or barrel 7 located within a plug socket in the cylinder and rotatable therein as by 'a key inserted into a key slot 8 to manipulate tumblers 9 and properly position them so that the plug or barrel may be turned, all of the parts thus far described being of old and well known. form and the construction and operation of which will be,therefore,well understoodby thoseskilled in the art.

One method of tampering with a lock of this type, has heretofore embodied the operation of drilling into the lock structure from the face thereof and thereby mutilatingfthe tumblers or other parts so that said tumblers would fail to. perform their function and prevent rotation of the key plug or barrel. With the lock thus mutilated the key gplfug or barrel may be turned by other means; ian' the key fitted for such lock, enabling-" undrill or other cutting tool to? 4, 1922. SerialNo. 604,667.

secured by such lock.

Several meanshave been devised for pre venting the mutilation'of such a lock to an extent to permit it to be operated, but such means have been directed toward the preventing of a drill or other cutting tool'from gaining access to of the lock.

I have provided means to not only prevent a drill or other cutting tool from having access to the tumblers or other parts, but further to cause attempts to gain access to' said tumblers to result in providing an additional means'to secure the plug orbarrel against turning movement.

authorized access to be had to the closure.

the tumblers or other parts In the form of construction herein illu'strated and described for securing these results I insert one or more barriers in the form of hardened metal plugs 10 in recesses 11 extending diagonally fromthe outersurface of the plug or barrel inwardly and lengthwise thereof, the months 12 of the recesses at the outer surface of the plug orbarrel being closed by the inner wall of the plug socket 13 in the cylinder 6. These barriers are placed in such positions as to inter.- cept the movement'of a drill or other cutting tool toward the locking members of the structure.

This arrangeme of the key'plug orbarrel. Should a hole be out into'one of the recesses 11 andthe cutting tool encounter a barrier further cutting operati on. would be prevented. Should then an implement be inserted through the hole thus cut for the purposeof removing the barrier by driving the same, the latter would be driven out of the mouth of its recess and wedged between theouter surface of the said plug or barrel and the wall ofthe socket in which said plug or barrel is located, and this would serveto wedge such plug or barrel and prevent it from being rotated.

Similarly I also provide recessesl l: in the key cylinder 6, extending from the outer sur face of said cylinder diagonally inward to a point at or near the surface ofthe plug or barrel '7, and I locate barriers -15, of hardened metal, within these recesses, such recesses and barriers being locatedv in suitable positions to intercept the movement of a tal arts of the lock struoturepand as liereriibe re de- 7 nt is also of advantage as an additional means for'preventmg rotation scribed with respect to the pliig dr barrel. The operation and result of any attempt to move the barriers vill be p the as above described with respect to the barrlers IO.

As another and additional means for preventing access to the vital parts of the look I provide a barrier ring 16 surrounding the cylinder against a flange 1 7,this ring preventing any unauthorized attempt to drill into the structure to reach the vital parts thereof. Any of the barriers above described may be so arranged as to prevent the piece 18 that closes the holes for the tumblers from being reached; V p n The barriers are fitted Within the recesses justtight enough to retain them in place by friction, but loose enough to enabl'them to be quite. readily moved when force is ap plied to them in a longitudinal direction;

In accordancewith the' provisions of the patent statutes I have described the principles of operation of my invention, togethef with the device whichl now eonsider to represent the best embodimentthereof; but I desire to have it understood that the device shown is only illustrative and that the in vention may be carried out by other means Within the scope of the appended claims.

I claim 1. A lock includinga member fitted; Within a smooth \valled socket, and hardened means Within said member to initially and solely prevent its movement by reason o'i a distortion and mutilation of the materia ofwhich solely prevnt iiiovement of said member in its socket by" a distortion and mutilation of members comprising said lock.

3. A-lock' including a member tted Within a socket and having a smooth walled recess opening to its outer surface, and-a hardened metal barrier held normally from movement insaid recess andadapted to initially and solely obstruct movement of said member and the distortion and mntila-tion thereof by penetration of said smooth Wall when said barrier is forced from normal, intended and inoperative position.

4. A look including a member fitted within a socket and having a diagonally ar ranged recess therein, and hardened metar barrier located in said recess to engage the tall of said socket and prevent movement or said member when said barrier is forced from its normal, intended and inoperative position. 3 I v v 5. lock including a cylinderfit-ted Within a socket and having a diagonally arranged recess therein, and a hardened metal barrier located insaid recess to engage the Wall of said socket and prevent 'inove'ment of said ineiiiher: when said barrier is forced from its 'nornial intended and inoperative position.

6. A look including a lug or barrel fitted Within a socket and having a diagonally ar ranged recess therein, and a hardenedmetal barrier located in said recess to engage the wall of said socket and-prevent movement of said member rvhein s'aid barrier is forced froniits normal, intended and inoperative position.

H 7. A look including a cylinder member fitted vvithin a socket, a plug or barrel member fitted Within a socket insaid cylinder member -both of said members having diagoiially arranged recesses, and hardened metal barriers located in. said recesses to engage the vvalls or said sockets and prevent movement of said members \vhen said barriers are forced from normal, intended and inoperative position.

ELMER B. STONE. 

